Optical diffuser



FIG. 1 is a front perspective view of an optical diffuser showing the present invention;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a side elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a front perspective view thereof, showing the optical diffuser in an environment of use.

The broken line portions shown in FIGS. 1 through 6 illustrate environmental subject matter only and form no part of the claimed design. 

CLAIM We claim the ornamental design for an optical diffuser, as shown and described. 